Chiko is a Luma-like star child from Super Mario Galaxy who accompanies Mario and Rosalina’s story as one of the small cosmic beings connected to the Comet Observatory. Chiko serves as a friendly guide and helper, often representing the playful, mysterious nature of space in the game. The character contributes to the atmosphere of exploration and wonder, and like other Lumas, is associated with stars, transformation, and the cosmic themes central to the series.